Moons and Planets added to Google Maps

Google Maps (screenshot)

The Moon and Mars were relatively early additions to Google Earth; that application may have been migrated to the web, but the planets and moons keep coming. Yesterday Google announced the addition of a dozen other worlds in our solar system; the space layer of Google Maps now includes planets Mercury, Venus and Mars; dwarf planets Ceres and Pluto;1 Jupiter’s moons Io, Europa and Ganymede; and Saturn’s moons Dione, Enceladus, Iapetus, Mimas, Rhea and Titan. Large moons Callisto and Triton aren’t included, and Iapetus is projected onto a sphere rather than appearing as the bizarre space walnut it is.

The Planetary Society’s Emily Lakdawalla noticed a thing, though:

Emily reports that this bug affects several moons of Jupiter and Saturn; Google is apparently already on it and may have fixed it by the time you read this.

3D Printed Planetary Globes

3d-printed-planets

On Shapeways, a site where users can upload and sell 3D-printed items, George Ioannidis is selling globes of the planets and moons of our solar system. There are individual globes, globes that take into account moons’ irregular topography (e.g. Phobos and Diemos, Iapetus), all in different sizes (none of which are very big: 50 to 200 mm), and collections where each planet and moon is to scale (as seen above, this can be somewhat unwieldy, but it’s neat for Jupiter’s Galilean moons, for example). I’m unreasonably enthusiastic about this sort of thing. [via]

Previously: Globes of the Solar System.

Ganymede and Mercury

Geologic map of Ganymede

The USGS has published a geologic map of Ganymede, Jupiter’s largest moon and the largest moon in the Solar System, based on imagery from the Voyager 1, Voyager 2 and Galileo probes. Via Centauri Dreams, Sky and Telescope.

Meanwhile, Sky and Telescope has produced a Mercury globe based on MESSENGER imagery. They already produce both visual and topographic globes of the Moon and Mars, as well as a globe of Venus coloured for elevation. (I’m crossing my fingers for globes of the outer moons, myself.)

I’m big on maps and globes of the rest of the Solar System. Recent entries: Maps of Mercury; Atlas of Vesta; A Topographic Map of Titan.

A Topographic Map of Titan

Global topographic map of Titan (NASA/JPL-Caltech/ASI/JHUAPL/Cornell/Weizmann)
NASA/JPL-Caltech/ASI/JHUAPL/Cornell/Weizmann

The Cassini team has released a global topographic map of Saturn’s moon Titan. What makes this map interesting is the fact that, due to its thick atmosphere, Titan can only be mapped by radar during Cassini’s close flybys. As a result, only half of its surface has been imaged, and only 11 percent has topography data. For this map, the remainder was, well, extrapolated:

Lorenz’s team used a mathematical process called splining—effectively using smooth, curved surfaces to “join” the areas between grids of existing data. “You can take a spot where there is no data, look how close it is to the nearest data, and use various approaches of averaging and estimating to calculate your best guess,” he said. “If you pick a point, and all the nearby points are high altitude, you’d need a special reason for thinking that point would be lower. We’re mathematically papering over the gaps in our coverage.”

Topo maps of parts of Titan have been released before, but not for the entire moon. See previous posts on The Map Room: Titan in Stereo; Topography of Titan.

Atlas of the Galilean Satellites

Book cover: Atlas of the Galilean Satellites Paul Schenk’s Atlas of the Galilean Satellites (Cambridge University Press, 2010) collects all the imagery gathered by the Voyager and Galileo missions of the four major moons of Jupiter (Callisto, Ganymede, Europa and Io, all discovered by Galileo in 1610) and assembles them into global, quadrangle and area maps. But this heavy, 400-page tome begins with a confession. “This Atlas is not what it should be.” The failure of the high-gain antenna on the Galileo spacecraft meant that far less data could be transmitted back to Earth during its nearly eight-year mission than had been planned. Large tracts of the moons are mapped in low resolution; the fuzzy images yield little detail. But until another mission is sent—the Juno probe now en route to Jupiter will not be studying the moons—this is all there will be for the foreseeable future. For decades, in fact.

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